Browser-native developer tools

Get the output.
Skip the clutter.

Free browser-based developer tools for JSON, Base64, URLs, UUIDs, JWTs, regex, hashes, passwords, CSV and HTML entities.

Local processingNo accountsNo dependencies

Browse all tools

toolbox.js

// useful defaults, zero uploads
const input = "messy data";

const result = compass
  .validate(input)
  .format({ clean: true });

// ready in this browser
console.log(result);

Ten focused utilities

One toolbox. Ten jobs.

Format, inspect, encode and generate without moving sensitive snippets through an unknown server.

{ }01

JSON Formatter

Paste JSON, validate it and switch between readable or compact output.

Open tool B6402

Base64 Encoder / Decoder

Convert Unicode text to Base64 and back without sending the content to a server.

Open tool %2003

URL Encoder / Decoder

Safely encode query values and decode percent escapes such as %20.

Open tool ID04

UUID Generator

Create standards-shaped random UUID v4 identifiers for test data, records and prototypes.

Open tool JWT05

JWT Decoder

Inspect the readable header and payload sections of a JWT without transmitting it.

Open tool /.*/06

Regex Tester

Run a JavaScript regex against sample text and inspect each match and capture group.

Open tool #07

Hash Generator

Create a hexadecimal SHA digest from text with the browser's native cryptography.

Open tool ***08

Password Generator

Create a random password locally with the character groups you choose.

Open tool ⇄09

JSON ↔ CSV Converter

Move simple table-shaped data between JSON and CSV without uploading a file.

Open tool &;10

HTML Entity Encoder / Decoder

Escape HTML-sensitive characters or convert entity references back to text.

Open tool

01Paste

Useful examples make every workspace understandable immediately.

02Run

Native browser APIs do the work locally with clear validation.

03Copy

The clean output is one obvious action away.

Get the output.Skip the clutter.